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use tidb_query_codegen::rpn_fn;
use tidb_query_common::Result;
use tidb_query_datatype::codec::data_type::*;
#[rpn_fn]
#[inline]
pub fn bit_count(arg: &Int) -> Result<Option<Int>> {
Ok(Some(Int::from(arg.count_ones())))
}
#[cfg(test)]
mod tests {
use std::i64;
use tipb::ScalarFuncSig;
use crate::test_util::RpnFnScalarEvaluator;
#[test]
fn test_bit_count() {
let test_cases = vec![
(Some(8), Some(1)),
(Some(29), Some(4)),
(Some(0), Some(0)),
(Some(-1), Some(64)),
(Some(-11), Some(62)),
(Some(-1000), Some(56)),
(Some(i64::MAX), Some(63)),
(Some(i64::MIN), Some(1)),
(None, None),
];
for (arg, expect_output) in test_cases {
let output = RpnFnScalarEvaluator::new()
.push_param(arg)
.evaluate(ScalarFuncSig::BitCount)
.unwrap();
assert_eq!(output, expect_output, "{:?}", arg);
}
}
}